1

HIV unlikely:
To have HIVtransmission there must be fluid transfer from one person to the next. If you had safe sex HIV would be very unlikely. Swollen lymph nodes can be seen in a large number of viral illnesses as well as with bacterial infections. See you doctor.
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2

Not poppable:
Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells and digested food. Lymph nodes "taste" the lymph for anything bad like bacteria/viruses/cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well.
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4

What is "Normal":
Lymphatic system absorbs/carries things too big to go into the arteries/veins lymph nodes "taste" the lymph for anything bad like bacteria/viruses/cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They come in all sizes from pea to lima bean. The are not usually easily felt.
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5

Monitoring Centers:
Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells and digested food. Lymph nodes "taste" the lymph for anything bad like bacteria/viruses/cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well.
...Read more

6

Monitoring Centers:
Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells and digested food. Lymph nodes "taste" the lymph for anything bad like bacteria/viruses/cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well.
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9

Lots of things:
Swollen lymph nodes may be swollen due to inflammation, infection, lymphoma, cancer, sarcoid or castlemann's disease.
I am sure there are other possibilities but off the top of my head these seem to be the most common.
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10

Monitoring Centers:
Lymphatic system absorbs/carries things too big to go into the arteries/veins like bacteria eaten by white cells and digested food. Lymph nodes "taste" the lymph for anything bad like bacteria/viruses/cancers, etc. When it detects a problem, it alerts the immune system and your body reacts. They enlarge in response to the inflammation they create when they react. They shrink when all is well.
...Read more